One mole of a gas with $$\gamma = \frac{5}{3}$$ is mixed with two moles of another non-interacting gas with $$\gamma = \frac{7}{5}$$. The ratio of specific heats $$\gamma = \frac{C_{P}}{C_{V}}$$ of mixture is approximately

A

1.50

B

1.46

C

1.49

D

1.53